If your doctor has suggested vardenafil for ED, you’re probably wondering how it actually compares to the more familiar names. Viagra. Cialis. The newer ones. They all sound similar on paper, and the marketing doesn’t help you sort it out.
Vardenafil (the active ingredient in Levitra and Staxyn) has been around since 2003. It’s a PDE5 inhibitor, the same drug class as sildenafil and tadalafil. But the differences in how each one behaves in the body matter more than most patients realize, especially if you’ve tried one and didn’t love the results.
Here’s the honest breakdown. What it does well, where it falls short, and who tends to do best on it.
How Vardenafil Works
Vardenafil blocks an enzyme called phosphodiesterase type 5 (PDE5), which lets blood vessels in the penis relax and fill more easily during sexual stimulation. It doesn’t cause an erection on its own. You still need arousal for it to work, which is something patients often miss when they first try it and assume the pill will do all the work.
The FDA approved vardenafil for the treatment of erectile dysfunction in adult men. It typically starts working in 30 to 60 minutes and lasts about 4 to 5 hours, which puts it roughly in the same window as sildenafil but with a slightly different side effect profile.
The film-coated tablet (Levitra) is swallowed with water. The orally disintegrating version (Staxyn) dissolves on the tongue and doesn’t need water, which some patients prefer for discretion.
Typical Dosage of Vardenafil for ED
Vardenafil comes in 2.5 mg, 5 mg, 10 mg, and 20 mg tablets. The standard starting dose is 10 mg taken about an hour before sexual activity, no more than once per day. Your prescriber will adjust based on how you respond and whether side effects show up.
A few situations call for a lower starting dose:
- Men over 65 often start at 5 mg
- Moderate liver impairment usually means 5 mg max
- Anyone on certain CYP3A4 inhibitors (like ketoconazole, ritonavir, or erythromycin) needs dose reduction
- Alpha-blockers for prostate or blood pressure require careful timing
The orally disintegrating Staxyn version comes only as 10 mg and isn’t interchangeable milligram-for-milligram with the regular tablet. Bioavailability is different.
Do not adjust the dose yourself. Your prescriber will determine the right dose for you based on your full medication list and medical history. This matters more than it sounds, because the interactions between PDE5 inhibitors and blood pressure medications can be significant.
Side Effects to Watch For
Most men tolerate vardenafil reasonably well. The common side effects are similar across all PDE5 inhibitors, and they usually fade as your body adjusts.
The frequent ones (reported in roughly 10% or more of users):
- Headache, often the most common complaint
- Flushing of the face and neck
- Nasal congestion or runny nose
- Indigestion or upset stomach
- Dizziness
Less common but worth knowing:
- Back pain or muscle aches
- Blurred vision or a bluish tint to colors
- Sinus pressure
The more serious ones are rare but require immediate attention. According to Mayo Clinic’s guidance on PDE5 inhibitors, call your doctor right away if you experience:
- An erection lasting more than 4 hours (priapism)
- Sudden vision loss in one or both eyes
- Sudden hearing loss or ringing in the ears
- Chest pain, irregular heartbeat, or fainting
One thing vardenafil specifically can do, more than sildenafil, is mildly prolong the QT interval on an EKG. If you have a history of arrhythmias or take medications that affect heart rhythm, your prescriber needs to know before writing this prescription.
Vardenafil vs Sildenafil vs Tadalafil
This is the question I get most often. Which one is "best"?
The honest answer is, it depends on what you’re optimizing for.
Vardenafil kicks in around 30 to 60 minutes and lasts 4 to 5 hours. Some men find it works at lower doses than sildenafil and produces less visual disturbance, but more headache and flushing in others. Food (especially high-fat meals) slows absorption a bit.
Sildenafil (Viagra) has the longest track record and the broadest generic availability. Similar onset, similar duration, but more reports of blue-tinted vision because of how it interacts with PDE6 in the retina. Many patients comparing generic sildenafil to brand Viagra find the generic works identically at a fraction of the cost.
Tadalafil (Cialis) is the outlier. It lasts up to 36 hours and comes in a low-dose daily form, which lets some men have sex without planning around a pill. The tradeoff is a longer window of potential side effects. If spontaneity matters to you, the tadalafil daily vs on-demand comparison is worth reading.
Avanafil (Stendra) is the newest and the fastest, often working within 15 to 30 minutes with fewer visual and cardiac side effects. If onset speed is your priority, the avanafil and sildenafil head-to-head breakdown covers that in detail.
For cost, vardenafil generics are widely available and typically run lower than brand-name Levitra. Compare prices on generic vardenafil at edrugstore.com if affordability is part of the equation.
Who Should Avoid Vardenafil
The single hardest contraindication is nitrate use. Combining vardenafil with nitroglycerin or any nitrate for chest pain can cause a catastrophic drop in blood pressure. This is non-negotiable. The FDA’s MedlinePlus drug information lists this as an absolute contraindication.
Other situations where vardenafil may not be appropriate:
- Recent heart attack, stroke, or unstable angina
- Severe liver disease
- End-stage kidney disease on dialysis
- Known QT prolongation or congenital long QT syndrome
- Use of certain alpha-blockers without careful dose adjustment
If you’ve been hesitant to bring up ED with your physician, this guide on talking to your doctor about erectile dysfunction walks through the conversation.
The Bottom Line
Vardenafil for ED is a solid, well-studied option that fits between sildenafil and tadalafil for most men. It works reliably for the majority who try it, the side effect profile is manageable, and the generic version makes it affordable. The right choice depends on your other medications, how spontaneous you want to be, and how your body responds to the first dose or two.
Talk to your pharmacist or prescriber about whether vardenafil for ED makes sense given your medical history and what you’re already taking. If the first PDE5 inhibitor you tried didn’t work well or caused side effects you couldn’t tolerate, switching within the class is often the next reasonable step.
This article is for informational purposes only and is not medical advice. Always consult a licensed pharmacist or physician before starting, stopping, or changing any medication.
References
- FDA Prescribing Information for Levitra (vardenafil), official approved labeling, indications, and dosing.
- Mayo Clinic: Erectile Dysfunction Medications, clinical overview of PDE5 inhibitors and warning signs.
- MedlinePlus: Vardenafil Drug Information, patient-facing summary of uses, contraindications, and side effects.
Dr Steven Schlosser
Dr. Schlosser graduated from Lafayette College Phi Beta Kappa and attended Georgetown Medical School. He had 4 years of medical residency training at Tufts University in Boston in both Gynecology and Internal Medicine. He has had a spotless medical career for the past 40+ years and is Board Certified. Learn More